Centrifugally-governed clutch-pulley.



G. D. HARRIS.

CENTRIFUGALLY GOVERNED CLUTCH PULLEY.

APPLICATION FILED JUNE 25. I915. RENEWED FEB. 11.1918.

Patented Nov. 5, 1918.

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enovnn 1o. HARRIS, or MILWAUKEE, Wisconsin.

CENTRIFUGALLY-GOVERNED CLUTCH-PULLEY.

' Application filed June 25, 1315, SerialNo. 36,170.

To all whom it may concern j Be it known that I, Gnovnn D. HARRIS, a citizen of the United States, residing at Milwaukee, county of Milwaukee, and State of Wisconsin, have invented new and useful Improvements in Centrifu'gally- Governed Clutch-Pulleys, of which the following is .producing a compact simple structure, self governing, and in which the controlling weights are so housed in, that even ifdislodged while the clutch is in operation, they cannot be thrown away from the pulley.

In the drawings 4 V Figure 1 is a-sectional view ofa clutch pulleyembodying my invention, drawn to a vertical plane exposing the supporting shaft.

Fig. 2 is a detail view.-sh0wing the driven member from its inner face, the shaft being shown in cross section.

Fig. 3is an opposing view of the driving member, also showing the shaft in cross section.

Like parts are identified by the same reference characters throughout the several views.

The shaft A is provided with a pulley B, the web Z) of which is provided with an annular projection 7), the side surface of which is faced off to form a bearing for a clutch ring C. A second pulley member D is provided with radially projecting portions d having ears d, between which the centrifugally governing levers E are pivoted at e. The leversE project inward radially from the pivot pins 0 and the inner ends are curved or elbowed. Withtheextremities E extending substantially parallel to the shaft A and in close proximity thereto within a cavity F formed, the member D. These extremities are provided with cross pins G and the cross pins carried by the respective levers are connected on each side of the shaft A by springs g.

The clutch ring C is provided with bosses on its outer surface having recesses or pockets H to receive projections J carried by the levers E. These projections J have rounded surfaces which fit loosely into the Specification of Letters Patent.

Patented Nov. 5,1918. Renewed February 11, 1918. j Serial neglects pockets H, the bases of which are also preferably rounded.

The portions'E of the levers E have sufficient, mass to constitute governing weights which are normally held in close proximity to the shaft by the tension of the springs. g.

They are preferably provided on each side of the shaft with mutually engaging stop lugs E, whereby they are mutually sup ported out of contact with the shaft A.

The tension of-the springs g tends to draw 7 the portions E ofthe levers toward the shaft until theseprojeetions E" engage each other. But said projections E willdnot be brought nto contact with each other under normal conditions, since the clutch operat- 7 ing projections J will first engage and press the clutch ring C against'the side face of the annulus bcarried by the pulley l3," thereby transmitting motion frictionally from the pulleyB to the ring C. Therotary movement of the ring C is transmitted tothe pulley D through the 'socketed proj ections J,

thelevers E, pivot pins 6-, ears cl and flange d. But when the speed becomes excessive,

the governing weights E move outwardly by'centrifugal force against the tension of the sprmgs g, thereby relieving clutch ring D from the pressure of the bearing lugs J and allowing said clutch ring to slip upon the annulus 6. Owing to the fact that the levers E are concealed within the member D and the'rim of the pulley B, protection is afforded against injurv to operatives in case thesprings 9 should break or pivot pins 6 become loosened. The device is also improved in appearance by concealing the controlling mechanism.

For the purpose of adjustably controlling the speed at which pulley D will be driven, Imount a manually operated screw in the end of the shaft bearing in axial alinement .withthe shaft. A tapered point on this screw bears upon the end of the shaft "at its axis. By turning up this screw I am able to cause a longitudinal-moVement of the shaft which will force pulleyB in-closer contact with floating ring C in opposition to springs 9. When the pressure is thus increased a greater speed will be necessary to release the driven pulley. A wheel threaded on the adjusting screw serves to lock this screw in any desired position.

I claim 1. The combination with a pulley provided with an annular member having a friction bearing side face, a ring in frictional bearing contact with said side face, a second pulley provided with an interior cavity, a set of governing levers pivoted upon said second pulley near the rim of the first mentioned pulley and having arms projecting into said cavity adjacent to the axis, and projections on said levers loosely interlocked with said ring.

The combination with a pulley provided with an annular member having a friction bearing side face, a ring in frictional bearing contact with said side face, a second pulley provided with an interior cavity, a set of governing levers pivoted upon said second pulley near the rim of the first mentioned pulley and having centrifugally swinging arms projecting inward ra- 'dially and axially into said cavity, pro ections on said levers loosely interlocked with said ring, and springs connecting the arms of said levers within said cavity.

3. The combination with a pulley having a portion thereof provided with an annular v friction bearing face, a clutch ring adapted to move parallel with the axis of said pulley into and out of contact with said bearing face, a second pulley provided with an interior cavity, a set of governing levers in- .closed by the walls of said cavity and the rim of the first mentioned pulley, said levers being pivotedvto said second pulley, connections adapted to transmit movement from I said levers to actuate said clutch ring in a direction parallel with the axis of said pulley, and springs adapted to normally hold said levers with the clutch ring in motion transmitting position, said levers being adapted to swing outwardly by centrifugal force under predetermined speed to release said clutch member, substantially as described.

4. The combination with a shaft, of a pulley thereon having a friction bearing annular side face, a clutch ring adapted for frictional bearing contact with said side face, a second pulley provided with an interior cavity, means for connecting one of said pulleys with the shaft, a set of governing levers pivoted upon said second pulley and having arms substantially parallel ith and in close proximity to the shaft and adapted to swing outwardly by centrifugal force within said cavity, projections-on said levers loosely interlocked with said clutch ring, springs adapted to press the lever arms in the direction of said shaft, and lugs on said arms adapted by mutual engagement to prevent the same from contacting with said shaft, substantially as described.

5. The combination with a shaft, of a pulley provided with an annular member having a friction bearing side face, a ring in frictional bearing contact with said side face, another pulley provided with an interior cavity, a set of governing levers pivoted upon said other pulley and having cen trifugally swinging arms projecting into said cavity, projections on said levers loosely interlocked with said ring, and means for connecting one of said pulleys with the shaft. 7

1 6; The combination with a shaft, of a pul ley provided with an annular member having a frictlon bearing side face, a ring in fractional bearing contact with said side face, another pulley provided with an interior cavity, a set of governing levers piv oted upon said other pulley and having cen and springs adapted to normally hold said levers with the ring in pressure contact with the side face of the first mentioned pulley.

7. The combination with a shaft of a pulley, of an annular bearing plate on the side of the web thereof, a floating ring adapted to bear frictionally on said plate, means for operatively communicating the motion. of said ring to a second pulley, centrifugally operated means for varying the friction be tween the ring and the plate in inverse proportion to the enginespeed, and means for also controlling said friction manually, said manually operated means comprising an axially adjustable screw bearing against the axis of the shaft whereby the latter and the pulley mounted thereon may be forced. in the direction of the other pulley, thereby increasing the pressure upon the bearing surfaces.

In testimony whereof I aflix my signature in the presence of two witnesses.

GROVER D. HARRIS.

Witnesses:

Lnvnnnrr Q, WHEELER, 7 "Ian; D. BREMTER.

7 Copies of this patent may be obtained for five cents each, by addressing the Commissioner or Patents.

Washington, D. G. 

